Improvement in safety-valves



i f N i -i ldliw 't-atte@ tement,

' JOHN D.LYN-DE, or'PH-ILADEZLPHIA, PENNSYLVANIA.

` Letters PatentNo 103,062, dated May 17, 1870; antcclated May 2, 1870,

` *uMPRovEMnN-r :1v :entre'rrr-Vanves.v

The Schedule referred to in these Letters'Patent and making part of the same.

l, JOHN D.` LYNDE, of the city and county of Phil- :adelphia and Stat-e of Pennsylvania,have invented following a specification.` V A This invention is an improvement' on my safetycertain Improvement-s in Safety-Valves, of which the the-lever, he lifted from the seat at will.

The-following is a description ofthe accompanying drawing, `which is a vertical section showing all theV parts A is the valve. l v

BIB, guide wings, four in number, ofthe valve, and

` connecting disk C to the valve, A, B, and() being all ot' same casting. y

D, rim against which the guide-wings bear.

E, guide-p in below the valve.

F, guide-nut. G, guide-nut braces.

H, annular passage for steam around the valve.

I I, projection on disk` G, .to prevent any mattei' from falling into the valve-chamber from above.

J, valve-spindle, on which rests the spring M, the lower endbeing turned-nearlyrto a point, and bearing in the central hole'in the valve A,` the bottom of? said central hole being below the point where the/valve bears on its seat.l i i Q, nut on spindle J, immediately `under the disk,

\ by which the valve would always he certa-in to he lifted when trying it'with the lever K.

` 'The spring M is compressed and the pressure regulated bythe bolts L L, cross-head "S, and nuts N N.

0, the cover held by the catches P P, and securely locked to prevent the valve from being tampered with. l

It is the valve-holder and base for cover to stand on.

'T is the valvescat,A which is extended upward around the valve to form the annular steam-passage and chamber, as described, with rim D.

The operation 'is-as follows: When the valve commences to open, the steam passing 'by it will pass ontrthrongh the narrow space l (one-sixtyefourth toone-thirty-second of an inch) bietween the disk C and rim D, but?, when the'pressnre increases about two pounds to the square inch, more steam will pass bythev valve than can pass by the disk through the small space described above. This 'willbc apparent from the fact that the edge of the disk enters the chamber made by rim D nearly onesixteenth of an inch, and, the sides of the `rim and disk being vertical, the space between them is notincreased until the valve has opened nearly one-sixteenth of a inch, before which more steam will pass by it than can pass the disk. Then the whole force and velocity of the rushing steam will be exerted against thealisk, which, from its concave .form, pre` sents great resistance to the steam, and consequently the pressure against the spring is increased, the power of compression overcome, the disk iand valve suddenly rise, permitting the steamto pass over the rim Dand it is blown oi rapidly until the pressure falls to about Where'the valve started to open, when it; will suddenly close, the spring being then able to overcome thc power of the steam against thevdisk.

I claim as my invention- The construction of the concave disk (l, with its projection I, and thearrangement and combination of the disk G, rim D, guidewings B, valve A, valvespindle J, and nut Q, substantially as described.

JOHN D. LYNDE. l

Witnesses;

C. A. LYNDE, J onN,H. SEBoLD. 

